Multiple k factor, selectable gas detector

G - Physics – 01 – N

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Details

G01N 25/22 (2006.01) G01N 25/30 (2006.01) G01N 33/00 (2006.01) G01N 33/22 (2006.01) G01N 33/28 (2006.01)

Patent

CA 2129113

A gas detector apparatus (2) as for determining the concentration of a selected (12) one of a plurality of predetermined gases includes a gas sensor (38) which generates a gas output signal related to the concentration of the selected (12) predetermined gas in the gas sample (22). A K factor storage (52) associated with the gas sensor (38) stores at least one K factor, unique to and generated by using the gas sensor (38), for each of the plurality of predetermined gases. A processor (56), in response to a selected (12) gas control signal (12), selects the K factor or factors from the K factor storage (52) for the selected gas and, in accordance with a predetermined process stored (74,76) therein, calculates a concentration signal representing the concentration of the selected gas in the gas sample.

Détecteur à gaz (2) permettant de déterminer la concentration d'un gaz sélectionné (12) parmi plusieurs gaz analysés préalablement; le détecteur comporte un capteur de gaz (38) produisant un signal de sortie correspondant à la concentration du gaz préalablement sélectionné (12) dans l'échantillon de gaz (22). Un stock de facteurs K (52), associé au capteur de gaz (38), conserve au moins un facteur K, unique pour le capteur de gaz (38) et généré par ce dernier, pour chacun des gaz analysés préalablement. Un processeur (56), réagissant à un signal de contrôle (12) pour un gaz sélectionné (12), choisit le ou les facteurs K, parmi les facteurs K stockés (52), pour le gaz sélectionné et, conformément à un processus déterminé préalablement et conservé (74,76), calcule un signal de concentration représentant la concentration du gaz sélectionné dans l'échantillon de gaz.

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